Although not mentioned in tbe OT, this scene was popular with medieval exegetes as a way of
explaining how it was "Jacob saw that there was corn in Egypt." (Gen 42:1). The idea is that when the years of famine had
set in, Joseph told his men to winnow the corn from his stores and throw the chaff into the river, whence it floated
downstream and was spotted by Joseph's father in Canaan - who thus deduced that corn was available in Egypt.